Answer:
a- say no thank you, and suggest a different activity
b- call someone to come pick you up and go home, or leave and go participate in a different activity.
c- say you're not interested
d- say no because those drugs are prescribed to your parents and nobody else
Explanation:
you still are polite, but make your intentions clear.
if there is another explanation needed, please let me know.
i hope this was helpful. :)